Raising and lowering gear for ships&#39; boats.



J. GRAHAM.

RAISING AND LOWERING GEAR FOR SHIPS BOATS.

APPLIOATION FILED JUNE 9,1913.

1,099,645. Patented June 9, 1914.

2 SHEETS-SHEET l.

J. GRAHAM.

RAISING AND LOWBRING GEAR FOR SHIPS BOATS.

APPLIOATION FILED JUNE 9, 1913.

1,099,645. Patented June 9, 1914.

2.;51TEETSSHBET 2.

COLUMBIA PLANOGRAPH CO..WAS|IINGTON. D. c.

JOHN GRAHABE,

on EBB-OX,

G-LASGG'], SCOTLAND.

RAISING AND LGVfElR-ING GEAR F0131 SHIPS BOATS.

i ,ooaeis.

Specification of Letters Patent.

Patented J one 9, 1914:.

Application filed June 9, 1913. Serial No. WZA'YQ.

To all whom may concern Be it known that 1 JOHN GRAIUUI, a citivccn ofthe United States of time ca, residing at lbrox, Glasgow, Scotland, haveinvented certain new and useful Improvements in Raising and LoweringGear for tlhips Boats of which the following is a specification,

This invention relates to boat raising and lowering gear of the class inwhich a single davit is employed said davit turning about a Verticalaxis and having winding gear thereon preferably adapted to be operatedin anu ally.

tinder the present invention instead. of having a single rope which iswound upon a drum operated by gearing and prrwided with a hand operatedbrake, I employ a chain which is arranged to pass over a chain wheel andbe actuated thereby and has one end attached to the da it structurewhile the other end is adapted to be paid into or out of the lower endof the dayit which is made hollow so as to form a suitable chainreceiving space or locker. Pref eraloly, the chain is arranged to passover guide pulleys in the upper part of the davit to the chain wheelaforesaid which is on a spindle carried on the darit and driven by spuror other gear from a driving shaft operated by a crank handle orhandles. From the chain wheel the chain passes up and over asecoud'chain wheel and then downward into the interior of the davit, Thesecond chain wheel is preferably provided'with a guard or muzzlesuitably arranged to pre vent the chain jumping on the wheel.

In connection with the winding gear, .l employ a self sustaining brakeof the differential pattern and which is adapted automatically to holdthe boat in any position during the raising or lowering operation shouldthe operators let go the handles or be washed away from their posts.

The invention also comprises other novel features hereinafter describedand pointed out in the claims.

A preferred form or embodiment of the invention is illustrated, by wayof example, on the drawings ap 'icnded hereto and founing part of thisspecification.

On the drawings: Figure 1 is a side view of the davit showing a boatraised off the checks ready for lowering. liip'. is a detached rid-e-view to an enlargi-ad sale of the winding and brake mechanism. is \idedwith a view of the winding and brake mechanism as seen in the directionof the arrow to Fig. 2. Fig. -il-. is an elevation and Fig. 5 a plan ofone form of locking device for the davit. Fig. (l is a plan of amodified form of dayit locking device. Fig. 7 is a View showing the boatsling attached to a boat and Figs. 8 and 9 are detail views of a partofthe boat sling. Fig. 10 is an enlarged View of the hook 59.

:l n cal-lying the invention into effect or practice in the mannerillustrated. by the accompanying drawings, the dayit 10 is built up ofsteel plates 70 strengthened by angle irons 71, bent to the necessaryshape and united by metal lattice work 72 and is provided with, a pairof side checks or brackets 11 in which is rotatably mounted a winchshaft 12 having securely mounted thereon, between the cheeks 11 a pinion13 and, ex ternal of the cheeks 11, a pair of winch handles 14;. Thepinion. 13 meshes with a second pinion 15 rotatably carried by a pin 16secured to, and projecting inwardly from, the right hand check 11. Ashaft 1'7 is r0- tatably carried by the cheeks 11 and has securelymounted thereon a spur wheel 18, a pinion 19 and a brake drum 20. Thespur wheel 18 meshes w'th the pinion l5 and the pinion 19 meshes with aspur wheel 21 on a pulley shaft which is rotatably mounted in the cheeksl1. and carries, securely mounted thereon, a chain driving pulley Thebrake drum is embraced by the brake band 24; of a self-sustaining brakeof the dilh-n'ential type and which may be adjusted or controlled bymeans of a screwed spindle mounted in bearing brackets :26 attached tothe cheeks 11, a hand wheel 27 being pro vided for turning same.

Guide pulleys 28 and E29 and an idle pulley 30 are provided in suitablepositions on the davit 10 and a chain 31, securer at one end to thedavit at 32 and passing around the pulley 3 f of a movable fall 33, ispassed over the guide pulley 29, guide pulleys 28, chain drijvin pulley23, idle pulley 30 and the free end thereof passed into a chain stowageor locker 35 formed by the hollow lower end of the dayit. The guidepulleys 28 are preferably plain grooved. pulleys while the idle pulley30 is a chain pulley and is also preferably provided with a guard ormuzzle 63 to prevent the chain jumping thereon. Of course. any or all ofthe pulleys may be pro guard or muzzle if desired,

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while bosses 62 are also preferably attached l to the cheeks 11 at theplaces where the sev eral shafts are journaled therein in order toprovide a larger bearing surface.

For the purpose of preventing a boat swinging outward, when .it is heldsuspended and the davitis being slewed, an arm 36 pivotally mounted onthe davit l and pro- 13 which, through the medium of the gearvided atits outer end with a pair of guides or brackets -37 adapted to engagethe gun wale or other suitable part of the boat in such a manner as toallow a certain amount of movement therehetween, thereby holding theboat in position relatively to the clavit but allowing it, at the sametime, a certain amount of lateral movement.

In order that the davit may be locked in position when desired there issecurely mounted thereon a journal or annulus 38 provided with a lateralsnug or projection 39 upon which are pivotally mounted, in brackets l0,pawls ll adapted to engage holes e2 in the deck gland l3 through whichthe ournal 38 passes. Arms ii of a bifurcated link 4.5 may be pivotallysecured to the pawls i1, said link being connected, at its upper end,with a lever to pivotally mounted on the davit- 10.

A modified form of locking device is illustrated at Fig. 6, whereon thedavit is provided with a journal 38, gland 43 and lever .46 as aforesaidbut in this case the snug or projection 39 is dispensed with and theholes %2 are replaced by radial slots 4-8. A pawl :tl, pivotally mountedon the davit 10 or journal 38, is adapted to engage the slots 48 formedin the gland a3 and is connected to the pivoted lever 46 by a plain link4:9. The lower end of the davit 10 is mounted in a foot-step bearing 50secured to a suit-able part of the ship, in the usual or any suitablemanner. lYith this darit, boats are slung by means of convergingbrackets 51 rigidly secured to the bottom of the boat and passingthrough eye 1 rackets secured to the seats 53. Each bracket is jointed,by means of a tumbler bolt 55, to one end of a swing link 54' whoseother end is jointed to a rigid member or link 56 which latter is againcon nected, by means of a flexible member 57 with an eye or link 58 withwhich the hook 59 0f the fall 38 of the davit is connected. Each swinglink has an arm or extension (30 thereon provided with a lateral guideeye or hook 61 of such shape as to allow the rigid member 56, whichpasses therethrough, a small amount of lateral play. lVith thisarrangeinent when a boat is launched and the slinging tackledisconnected from the davit hooktlie rigid members or links 5% are heldin place by the eye or hook 61 of the extension '60 until the tumblerbolts are re moved, thus preventing any injury to passengers owing tothe fall of the slinging tackle whenit is disconnected from the davit.

lVhen it is desired to launch a boat the boat tackle is secured inposition and the davit slowed until the link 58 can be passed over thehook The davit is then preferably locked by means of one of thehereinbefore described locking devices and the winch handles It turnedin the proper direction. The turning of the handles let rotates thepinion ing hereinbefore described. rotates the chain 3 l s 1 u l drivingpulley 23 whicn causes the chain 31 5 to raise the fall 33 and therebylift the boat from the checks, the excess chain, instead of being woundaround a drum, being paid into the chain receptacle or locker 35. lVhenthe boat is raised sutliciently to clear the checks, the davit is slewedoutboard and, preferably, locked in position and the boat lowered. To

; raise and stow a boat the operation is, of course, the converse ofthat aforesaid.

The hook 59 has a tongue (.35 pivoted thereto, at ($6, and provided witha heavier extension 67 this extension having a recess 68 with which aspring (59 on the body of the hook can engage. \Vith this constructionwhen the link 58 is inserted in the hook 59 the downward pull depressesthe tongue and brings the extension 67' into the position shown so thatthe spring 69 automatically engages the recess in the extension.Normally the action of the weighted extension 6? tends to raise hetongue and keep the hook open so that the link can readilv be engaged,and when engaged the hook is closed by the pull of the link. Should,however. the action of a wave lift the boat sufiiciently to take thepull 0a the link 58 the tongue cannot rise as the extension is held bythe spring (39.

Should the operators leave their post, either when raising or lowering,and the 5'1 weight of the boatconnnence to pay out the chain, theself-sustaining or diflerential brake at once acts and brings the boatto a standstill. In the case of raising and lowering a light boatinstead of having the one 11g end of the chain attached to the davitthis end may simply han down free and be provided with a hook (thusdoing away with the bottom block at its lower end) a check beingprovided on the chain at a short distance H5 from the hook to prevent itrunning through the pulley at the top of the davit.

if so desired the hoisting gear may, instead of being operated by hand,be operated by means of steam, hydraulic, electric or 129 other power,the power being applied to the shaft 12.

Having now fully described my invention what I claim and desire tosecure by Letters Patent is 1. A ships davit hollow at its lower end, achain wheel thereon, means for rotating said chain wheel, a second chainwheel, a guide pulley on the davit and a chain pass ing around the chainwheels and guide pul- 1 0,

.ley and having one end secured to the davit structure and the other endadapted to be paid into the hollow lower end of the davit. l 2. A davithaving its lower part adapted a chain wheel thereon, means for rotatlngto be passed through the ships deck and be rotatably mounted therein,said davit being hollow at its lower end, a chain wheel thereon, meansfor rotating said chain wheel, a second chain wheel, a guide pulley onthe davit and a chain passing around the chain wheels and guide pulleyand having one end secured to the davit structure and the other endadapted to be paid into the hollow lower end of the davit.

3. A ships davit hollow at its lower end, a chain wheel thereon, meansfor rotating said chain wheel, a second chain wheel located above thelevel of the first chain wheel and directly above the hollow lower endof the davit, a guide pulley on the davit and a chain passing around thechain wheels and guide pulley and having one end secured to the davitstructure and the other end adapted to be paid into the hollow lower endof the davit.

4;. A davit having its lower part adapted to be passed through the shipsdeck and be rotatably mounted therein, said davit being hollow at itslower end, means for locking the davit in desired positions, two chainwheels thereon one of which is located above the other, means forrotating one of said chain wheels, a guide pulley on the davit and achain passing around the chain wheels and guide pulley and having oneend secured to the davit structure and the other end adapted to be paidinto the hollow lower end of the davit.

5. A ships davit hollow at its lower end, two chain wheels thereon oneof which is located above the level of the other, means for rotating oneof said chain wheels. a guide pulley on the davit, a chain passingaround both chain wheels and the guide pulley and having one end securedto the davit structure and the other end. adapted to be paid into thehollow lower end of the davit and means for preventing the chain jumpingoil the upper chain wheel.

6. A ships davit hollow at its lower end, two chain wheels thereon oneof which is located alcove the level of the other, means for rotatingone of said chain wheels, a guide pulley on the davit, a chain passingaround both. chain wheels and the guide pulley and having one endsecured to the davit structure and the other end adapted to be paid intothe hollow lower end of the davit, means for preventing the chainjumping oil the upper chain wheel. a journal on the davit, a projectionon said journal, pawls pivoted on said projection, a gland adapted to besecured to the ships deck and within which the journal is adapted torotate, a flange on said gland having holes therein with which saidpawls are adapted to engage and means for moving said pawls into or outof engagement with said holes.

? A ships davit hollow at its lower end,

said chain wheel, a second chain wheel, a guide pulley on the davit, achain passing around the chain wheels and guide pulley and having oneend secured to the davit strut-tn re and the other end adapted to bepaid into the hollow lower end of the davit, and means whereby themovement of the chain is arrested should the winding mechanism hereleased when a weight is suspend ed from the chain.

8. A, ships davit hollow at its lower end, a chain wheel thereon, meansfor rotating said chain wheel, a second chain wheel. located above thelevel of the first chain wheel and directl; above the hollow lower endof the davit, a guide pulley on the davit and a chain passing around thechain wheels and guide pulley and having one end secured to the davitstructure and the other end adapted to be paid vertically downward -fromsaid second chain wheel into the hollow lower end oi the davit.

9. A ships davit hollow and tapered at its lower end, a chain wheelthereon, means for rotating said chain wheel, a second chain wheel, aguide pulley on the davit and a chain passing around the chain wheelsand guide pulley and having one end secured to the davit structure andthe other end adapted to be paid into the hollow lower end of the davit.

10. A ships davit made of an openwork structure and hollow througl'ioutits length, guide pulleys arranged within the hollow davit, a chainwheel carried outside the hollow davit, a second chain wheel rotat-ablyarranged within the hollow davit and above the level of the first chainwheel, a chain which is secured at its one end to the upper end of thedavit and passes through the hollow davit and over the guide pulleystherein to and under the first chain wheel then up and over the secondchain wheel and down into the interior of the lower end of the davit andmeans for rotating the first chain wheel.

11. A ships davit made of an openwork structure and hollow throughoutits length. guide pulleys arranged within the hollow davit, a chainwheel. carried outside the hollow davit, a second chain wheel rotatablyarranged within the hollow davit and above the level of the first chainwheel, a chain which is secured at its one end to the upper end oi" thedavit and passes through the hollow davit and over the guide pulleystherein to and under the first chain wheel then up and over the secondchain, wheel and down into the interior of the lower end of the davit,means for rotating the first chain wheel, a chain pulley block carriedby the chain, said pulley block having a self looking hook thereon withpivoted extension therein and means for locking said extension.

12. A ships davit made of an openwork structure and hollow throughoutits length,

guide pulleys arranged within the hollow I davit, a chain wheel carriedoutside the hollow davit, a second chain wheel rotatably arranged withinthe hollow davit and above the level of the first chain wheel, a chainwhich is secured at its one end to the upper end of the davit and passesthrough the hollow davit and over the guide pulleys therein to and underthe first chain wheel then up and over the second chain wheel and downinto the interior of the lower end of the davit, means for rotating thefirst chain wheel, a chain pulley block carried by the chain, saidpulley block having a self locking hook thereon, with pivoted extensiontherein, means for locking said extension, a pair of rigid members,means adapted to connect said members to said hook a Jair of bracketspivotally connected with said links and adapted to be secured to a boatand means for holding said rigid members in extended position when theyare disconnected from said hook.

l3. Slinging tackle for use in connection with a davit, such asdescribed, comprising converging brackets adapted to be secured to aboat, swing links pivotally secured to said brackets and havin arms orextensions provided with lateral guide eyes or hooks, rigid memberspivotally secured to said swing links and passing through said guideeyes or hooks and means adapted to connect said rigid members to thedavit chain.

in testimony whereof I afiiX my signature in presence of two witnesses.

JOHN GRAHAM. lVitnesses 2 HUGH D. FITzrATRIcK, CECIL C. GALL.

Copter of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I U.

